AirHint found the following cheapest return flights from Seoul (ICN) to Ulaanbaatar (UBN) in May 2026 (see full year).

Return flights

11 May - 21 May	Asiana Airlines	direct
23 May - 26 May	Asiana Airlines	direct
02 May - 05 May	Asiana Airlines	direct
10 May - 15 May	Korean Air	direct
11 May - 15 May	Korean Air	direct
28 May - 30 May	Korean Air	direct
13 May - 16 May	Korean Air	direct
31 May - 07 Jun	Korean Air	direct
01 May - 07 May	Korean Air	direct
01 May - 05 May	Air China

Also check the deals for one-way flights from Seoul to Ulaanbaatar in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seoul to Ulaanbaatar in May from $355

Return flights